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Segment Information (Operations By Lines Of Business) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 24, 2017
Jun. 25, 2016
Jun. 24, 2017
Jun. 25, 2016
Sep. 24, 2016
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers $ 984,397,728 $ 957,177,645 $ 2,913,308,035 $ 2,832,603,557  
Total income from operations 29,663,975 31,864,964 86,882,271 96,623,387  
Total assets 1,706,062,266   1,706,062,266   $ 1,686,478,299
Elimination of intercompany receivable [Member]          
Segment Reporting Information By Segment [Line Items]          
Total assets (1,623,000)   (1,623,000)   (2,415,000)
Grocery [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 341,442,000 337,030,000 1,044,531,000 1,046,616,000  
Non-foods [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 212,322,000 207,575,000 625,890,000 608,601,000  
Perishables [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 265,828,000 257,799,000 770,350,000 753,027,000  
Gasoline [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 129,569,000 120,347,000 366,175,000 321,049,000  
Retail [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 949,161,000 922,751,000 2,806,946,000 2,729,293,000  
Total income from operations 25,350,000 28,031,000 74,947,000 84,669,000  
Total assets 1,574,392,000   1,574,392,000   1,555,319,000
Other Segment [Member]          
Segment Reporting Information By Segment [Line Items]          
Total revenues from unaffiliated customers 35,237,000 34,427,000 106,362,000 103,311,000  
Total income from operations 4,314,000 $ 3,834,000 11,935,000 $ 11,954,000  
Total assets $ 133,293,000   $ 133,293,000   $ 133,574,000